Hello - I recently read your post on Perspective Projection and found it immensely helpful: however, I've run into the issue of camera rotation. How would I go about calculating the projection after rotating the camera? I assume some trigonometry is involved, but I can't figure out where it would be applied.

You're welcome Tricky Widget. I know how you feel, but remember that matrices are very important to 3D graphics and especially perspective transformations. One the basic equations are understood though, using matrices is much easier.

Thank you, thank you, thank you for your post on calculating perspective projection! I'd been digging all day long and all I could find was people going on and on about trigonometry and matrix transformations and it made me very sad. But your explanation was very clear and the simple formulas are a breeze to use! Thank you so much! :)

Hey thanks for the tip about the char function, I have the program testing through. The Problem is: The program is count the characters but not identifing the vowels and adding the up to output on the screen. Any suggestions are great thanks.